A nurse performs cardiopulmonary resuscitation (CPR) for 1 minute on an infant without calling for assistance. In reassessing the infant after I minute of CPR, the nurse finds that he still isn’t breathing and that he has no pulse. The nurse should then

A. resume CPR beginning with breaths.
B. declare her efforts futile.
C. resume CPR beginning with chest compressions.
D. call for assistanc

设计阶段要处理好投资、质量、进度三者之间的关系，其中( )是最重要的。

A．投资
B．进度
C．质量
D．投资和进度